We are told that Roy has a fear of balloons, yet previously, when shooting the geek calendar, he was quite happily taking photos in a room filled with balloons.
When having lunch in the park, Moss has a complete flight simulator set up with yoke stick, peddles etc connected to his laptop.
When leaving the park, he only has a small backpack which couldn't hold all that equipment.
When at the party both Douglas and Jen are seen sucking on a sheesha pipe though there is no smoke. When that pipe is revealed it lacks the tobacco holder or any coals to actually produce smoke so they had nothing to suck on.
The area of a suspected bomb was closed off on only one side, allowing Roy and Moss to accidentally go right next to the suspected bomb. This is a severe oversight by the police.